If you want to learn about something in particular it helps to ask the experts. Just remember the experts aren't always the people with degrees and a scholarly background. If you want to know how to stay safe in the water ask people who work on the water.
gCaptain calls itself "The Site for Maritime Professionals" and it seems to live up to its own billing. Recently on its blog there have been two articles about water safety by Mario Vittone. Drowning Doesn't Look Like Drowning and The Truth About Cold Water. They are both well worth a read.
gCaptain's blog can lead to all sorts of discoveries. I quickly stumbled across a link to Low-tech Magazine's article on Lost knowledge: ropes and knots. I have more than a few books on knots. I used to be handy at some of the more typical knots used on small water craft. The list of links at the end sent me running off to look into the art of splicing ropes together. Something I never did get around to learning to do.
With some water safety tips to learn and some knots to relearn I better be careful or I'll find myself in a dinghy soon sailing around Lake Ontario.